So, I tried re-reading parts of the Theon story and I might be just missing something, but if it continues as it looks I am going to be very upset.

I don't remember this archer kid at all. Can anyone refresh my memory as to who he is?

Doesnt exist. We are never told exactly what happens during this time. I am assuming that this archer is Ramsey Bolton playing a trick on him. Could also be the original reek. The reaction the men had when it was "the boy" that killed them when Theon was escaping came as an expression of shock. Which leads me to believe that it is Ramsey getting Theon's hopes up.